Knowledge

Valve stem---Parts that transmit the opening and closing force to the opening and closing parts Stem nut---Parts that form a kinematic pair with the v

The valve bonnet is connected to the valve body one by one and together with the valve body (or through other parts, such as diaphragms, etc.), consti

The valve body is directly connected to the pipeline (or equipment) one by one and forms the part of the medium flow channel. The valve body bears the

Valve body Valve plate Valve seat Valve stem Upper seal seat Valve bonnet Packing gland Packing plate Bracket Valve stem nut

1) Linear flow characteristics refer to the linear relationship between the relative flow rate of the valve and the relative opening, that is, the flo

Flow Coefficient The flow coefficient of a valve is one of the important parameters to measure the flow capacity of the valve. The size of the flow co

1) China pressure-temperature rating standard "Steel Valves - General Requirements" GB/T 12224 "Steel Pipe Flange Technical Conditions&

Pressure-temperature rating: refers to the maximum allowable working pressure expressed as gauge pressure at a specified temperature. As the temperatu

GB/T 1048-2005 "Definition and Selection of Piping Components PN (Nominal Pressure)" is defined as follows: Nominal Pressure: An alphanumeri

GB/T 1047-2005 "Pipeline Components DN (Definition and Selection of Nominal Dimensions)" is defined as follows: A nominal size is an alphanu

International Standard ISO American National Standard ANSI American Petroleum Institute Standard API American Society for Testing and Materials Standa

GB National standard JB Machinery Industry Standard HG Chemical Industry Standard SY Petroleum Industry Standard SH Sinopec Corporation Standard EJ Nu